Switching circuit and energy storage power supply

Abstract

The embodiment of the utility model discloses a switch circuit and an energy storage power supply, the switch circuit comprises a voltage detection module, an alternating voltage module and a time delay switch module, the voltage detection module is connected with the alternating voltage module and an input power supply, and the time delay switch module is connected with the alternating voltage module, the input power supply and an auxiliary source power supply circuit; the voltage detection module is used for detecting voltage change of an input power supply and outputting a first detection signal; the alternating voltage module generates a trigger signal according to the voltage change of the first detection signal; the time-delay switch module is switched on in response to the trigger signal, so that the input power supply supplies power to the auxiliary power supply circuit and is switched off when the trigger signal disappears at a preset time. According to the embodiment of the utility model, the switch is triggered by utilizing the characteristic that the input voltage firstly decreases and then rises, so that the problem that a trigger point is too high and is difficult to turn on or too low and is difficult to turn off when a fixed voltage is used as a trigger condition is avoided, and meanwhile, the waste of electric quantity and continuous output in a power-lacking state are effectively prevented.

Description

Technical Field

[0001] This utility model relates to the field of electronics, and in particular to a switching circuit and an energy storage power supply. Background Technology

[0002] With the increasing demand for travel and outdoor activities and the booming development of the portable energy storage market, the demand for fast charging for vehicles that can use car batteries connected to the car engine to charge portable energy storage devices is also growing. These fast charging devices are usually compact, lightweight and high-powered, and can meet people's needs for charging portable energy storage devices while the car is in motion.

[0003] Since fast charging for vehicles is powered solely by the car battery, the auxiliary power supply circuit that powers its control circuit is also supplied by the car battery. However, if this auxiliary power supply circuit operates for extended periods when the car is not running, it will continuously drain the battery, potentially leading to a depleted battery. Therefore, it is necessary to design an auxiliary power input switch circuit that allows the auxiliary power supply to operate only when the battery voltage is suitable.

[0004] Meanwhile, common auxiliary power input switch circuits use battery voltage as the trigger condition for the switch. The switch opens when the battery voltage is above a certain set value and closes when it's below. However, since the alternator takes time to charge the battery, if the trigger point is set too high, it takes a long time to start the circuit each time. Conversely, if the trigger point is set too low, the battery voltage rises after each use due to charging, making it difficult to turn off the circuit and wasting battery power. This design is contradictory. Utility Model Content

[0005] The main technical problem solved by this utility model embodiment is to provide a switching circuit and energy storage power supply, which can solve the problem that after the auxiliary power input switching circuit is turned on, the voltage of the battery increases due to charging, and the switching circuit is difficult to turn off for a long time, resulting in the waste of battery power.

[0006] To solve the above-mentioned technical problems, the present invention provides a switching circuit comprising: a voltage detection module, an alternating voltage module, and a time-delay switch module. The input terminal of the voltage detection module is connected to an input power supply, and the output terminal of the voltage detection module is connected to the input terminal of the alternating voltage module. The controlled terminal of the time-delay switch module is connected to the output terminal of the alternating voltage module, the input terminal of the time-delay switch module is connected to the input power supply, and the output terminal of the time-delay switch module is connected to an auxiliary power supply circuit. The voltage detection module detects voltage changes in the input power supply and outputs a first detection signal. The alternating voltage module generates a trigger signal based on the voltage change of the first detection signal. The time-delay switch module is activated in response to the trigger signal, enabling the input power supply to power the auxiliary power supply circuit, and deactivates after a preset time following the disappearance of the trigger signal.

[0007] In some embodiments, the alternating voltage module includes an isolation unit and a clamping unit. The input terminal of the isolation unit is connected to the output terminal of the voltage detection module, and the output terminal of the isolation unit is connected to the input terminal of the clamping unit and the controlled terminal of the delay switch module. The isolation unit is used to output a voltage signal to the clamping unit when the voltage of the first detection signal changes. The clamping unit is used to clamp the voltage signal within a preset voltage to output the trigger signal to the delay switch module.

[0008] In some embodiments, the delay switch module includes a delay unit and a switch unit. The controlled terminal of the delay unit is connected to the output terminal of the alternating voltage module, the output terminal of the delay unit is connected to the controlled terminal of the switch unit, the input terminal of the switch unit is connected to the input power supply, and the output terminal of the switch unit is connected to the auxiliary power supply circuit. The delay unit is used to output a drive signal to the switch unit in response to the trigger signal, and to extend the output of the drive signal for a preset time after the trigger signal disappears. The preset time depends on the charging time of the capacitor in the delay unit. The switch unit is used to turn on in response to the drive signal, so that the input power supply supplies power to the auxiliary power supply circuit. The switch unit is turned off when no drive signal is received.

[0009] In some embodiments, the switching circuit further includes: a control module, the input terminal of which is connected to a control device, and the output terminal of which is connected to the controlled terminal of the switching unit; after the input power supply supplies power to the auxiliary power supply circuit, the control module is configured to output the drive signal to the switching unit in response to the control signal of the control device; the control module is also configured to stop outputting the drive signal when it does not receive the control signal.

[0010] In some embodiments, the voltage detection module includes resistor R4 and resistor R1. The first end of resistor R4 is connected to the positive output terminal of the input power supply, the second end of resistor R4 is connected to the first end of resistor R1 and the input terminal of the alternating voltage module, and the second end of resistor R1 is connected to the negative output terminal of the input power supply.

[0011] In some embodiments, the isolation unit includes a capacitor C2, the clamping unit includes a diode D1 and a resistor R5, the first end of the capacitor C2 is connected to the output terminal of the voltage detection module, the second end of the capacitor C2 is connected to the cathode of the diode D1, the first end of the resistor R5 and the controlled terminal of the delay switch module, and the anode of the diode D1, the second end of the resistor R5 and the negative output terminal of the input power supply are connected.

[0012] In some embodiments, the delay unit includes a capacitor C1 and a switching transistor Q3. The base of the switching transistor Q3 is connected to the output terminal of the alternating voltage module. The collector of the switching transistor Q3 is connected to the first terminal of the capacitor C1 and the controlled terminal of the switching unit. The emitter of the switching transistor Q3, the second terminal of the capacitor C1, and the negative output terminal of the input power supply are connected.

[0013] In some embodiments, the switching unit includes resistors R2 and R3 and a switching transistor Q1. The first end of resistor R2 is connected to the positive output terminal of the input power supply and the emitter of the switching transistor Q1. The second end of resistor R2 is connected to the first end of resistor R3 and the base of the switching transistor Q1. The emitter of the switching transistor Q1 is connected to the auxiliary power supply circuit. The second end of resistor R3 is connected to the output terminal of the delay unit. The second end of capacitor C1 is connected to the negative output terminal of the input power supply.

[0014] In some embodiments, the control module includes a resistor R6 and a switching transistor Q2. The first end of the resistor R6 is connected to the control device, the second end of the resistor R6 is connected to the base of the switching transistor Q2, the collector of the switching transistor Q2 is connected to the controlled terminal of the switching unit, and the emitter of the switching transistor Q2 is connected to the negative terminal of the input power supply.

[0015] To solve the above-mentioned technical problems, another technical solution adopted by this utility model is to provide an energy storage power supply, including the switching circuit described above.

[0016] The beneficial effects of this utility model embodiment are as follows: Unlike the prior art, this utility model embodiment sets up an alternating voltage module and a time delay switch module, and uses the characteristic that the battery voltage first decreases and then rises when the car starts to trigger the switch to conduct. After the auxiliary power source starts working, the control is handed over to the control device, which avoids the problem that the trigger point is set too high and difficult to turn on or too low and difficult to turn off when a fixed voltage is used as the trigger condition. At the same time, it effectively prevents the waste of battery power and continuous output when the battery is depleted. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a switching circuit provided in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of an alternating voltage module provided in an embodiment of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of a time delay switch module provided in an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of another switching circuit provided in an embodiment of the present invention;

[0021] Figure 5 This is a circuit diagram of a switching circuit provided in an embodiment of the present invention. Detailed Implementation

[0022] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0024] Example 1

[0025] Please see Figure 1This embodiment provides a switching circuit 10, including a voltage detection module 110, an alternating voltage module 120, and a time-delay switch module 130. The input terminal of the voltage detection module 110 is connected to the input power supply 20, the output terminal of the voltage detection module 110 is connected to the input terminal of the alternating voltage module 120, the controlled terminal of the time-delay switch module 130 is connected to the output terminal of the alternating voltage module 120, the input terminal of the time-delay switch module 130 is connected to the input power supply 20, and the output terminal of the time-delay switch module 130 is connected to the auxiliary power supply circuit 30.

[0026] The operation of the switching circuit 10 is as follows: First, the voltage detection module 110 detects the voltage change of the input power supply 20. When the input power supply 20 is a car battery, during the car starting process, due to the operation of electrical appliances such as the starter motor, the battery voltage will first drop to about 8V, and then gradually rise back to the normal voltage after the alternator starts. The voltage detection module 110 converts this voltage change process into a first detection signal and outputs it to the alternating voltage module 120.

[0027] After receiving the first detection signal output by the voltage detection module 110, the alternating voltage module 120 generates a trigger signal based on the voltage change of the signal. Specifically, when the first detection signal indicates that the input power supply 20 voltage has decreased, or when the first detection signal indicates that the input power supply 20 voltage has increased, the alternating voltage module 120 will output a voltage signal, which is an alternating voltage.

[0028] The time-delay switch module 130 responds to the trigger signal output by the alternating voltage module 120 and remains in a conducting state for a preset time, thereby enabling the input power supply 20 to supply power to the auxiliary power supply circuit 30. The preset time can be controlled by the charging and discharging time of the energy storage element (such as a capacitor) in the time-delay switch module 130.

[0029] Through the above structure and working process, the switching circuit of this embodiment can accurately identify the voltage change characteristics when the car starts, and only conducts to supply power to the auxiliary power supply circuit after the car is started, effectively avoiding the problem of battery drain caused by the auxiliary power supply circuit working continuously when the car is not started. At the same time, this circuit does not rely on a fixed voltage threshold as a trigger condition, overcoming the contradiction of trigger point setting in traditional circuits.

[0030] Example 2

[0031] Please see Figure 2 This embodiment details the internal structure of the alternating voltage module 120. The alternating voltage module 120 includes an isolation unit 121 and a clamping unit 122. The input terminal of the isolation unit 121 is connected to the output terminal of the voltage detection module 110, and the output terminal of the isolation unit 121 is connected to the input terminal of the clamping unit 122 and the controlled terminal of the time delay switch module 130, respectively.

[0032] During circuit operation, isolation unit 121 first receives a first detection signal from voltage detection module 110. When the input power supply voltage decreases, the level of the first detected voltage decreases accordingly, and isolation unit 121 outputs an alternating voltage signal; when the input power supply voltage rises again, the level of the first detected voltage rises accordingly, and isolation unit 121 also outputs an alternating voltage signal. Isolation unit 121 utilizes the characteristics of its internal components to achieve the function of allowing AC signals to pass while blocking DC signals.

[0033] Clamping unit 122 receives the voltage signal output by isolation unit 121. When it receives the first voltage signal, clamping unit 122 clamps the signal within a preset voltage to output a trigger signal to delay switch module 130. Through this design, alternating voltage module 120 can effectively identify rapid changes in the input power supply voltage.

[0034] Example 3

[0035] Please see Figure 3 This embodiment details the internal structure of the time-delay switch module 130. The time-delay switch module 130 includes a delay unit 131 and a switch unit 132. The controlled terminal of the delay unit 131 is connected to the output terminal of the alternating voltage module 120, and the output terminal of the delay unit 131 is connected to the controlled terminal of the switch unit 132. The input terminal of the switch unit 132 is connected to the input power supply 20, and the output terminal is connected to the auxiliary power supply circuit 30.

[0036] The main function of the delay unit 131 is to receive the trigger signal output from the alternating voltage module 120 and output a drive signal to the switching unit 132. After the trigger signal disappears, it extends the output of the drive signal for a preset time to ensure the conduction time of the switching unit 132. This preset time is determined by the charging and discharging characteristics of the energy storage element inside the delay unit 131. The delay unit 131 achieves precise delay control through the charging and discharging process of the energy storage element.

[0037] The switching unit 132 responds to the drive signal output by the delay unit 131 to achieve conduction control. When a drive signal is received, the switching unit 132 is turned on, allowing the input power supply 20 to supply power to the auxiliary power supply circuit 30; when no drive signal is received, the switching unit 132 is turned off, cutting off the power supply from the input power supply 20 to the auxiliary power supply circuit 30. Through the above structural design, the delay switch module 130 effectively combines switching and delay functions.

[0038] Example 4

[0039] Please see Figure 4Based on Embodiments 1 and 4, the switching circuit 10 in this embodiment further includes a control module 140. The input terminal of the control module 140 is connected to the control device 40, and the output terminal of the control module 140 is connected to the controlled terminal of the switching unit of the delay switch module 130.

[0040] In this embodiment, after the input power supply 20 starts supplying power to the auxiliary power supply circuit 30 through the delay switch module 130, the conduction state of the delay switch module 130 is controlled by the control module 140 to ensure that the input power supply 20 can continuously supply power to the auxiliary power supply circuit 30, since the delay switch module 130 has a delayed shutdown function. In response to the control signal output by the control device 40, the control module 140 outputs a drive signal to the delay switch module 130. When the control module 140 does not receive the control signal from the control device 40, it stops outputting the drive signal, causing the delay switch module 130 to turn off, thereby cutting off the power supply from the input power supply 20 to the auxiliary power supply circuit 30. At this time, the conduction or shutdown of the delay switch module 130 is controlled by the control module 140, forming another control branch.

[0041] Specifically, the control device 40 can be a microcontroller or other control device. Once the auxiliary power supply circuit 30 starts operating, the control device 40 can control the turn-on or turn-off of the delay switch module 130 via the control module 140, based on actual operating requirements. For example, the control device 40 can determine whether to maintain power supply based on the operating state of the auxiliary power supply circuit 30, the voltage level of the input power supply 20, the system load, and other conditions.

[0042] Compared to Embodiment 1, this embodiment adds a control module 140, achieving dual control of the switching circuit: on one hand, the alternating voltage module 120 detects the vehicle's starting characteristics to achieve automatic conduction; on the other hand, after the auxiliary power source starts working, control is handed over to the control device 40, making the switching control more flexible and reliable. This design avoids the limitations of relying solely on voltage trigger point control, enabling precise control of the switching state according to actual working requirements, further improving the circuit's practicality and reliability.

[0043] Furthermore, the control module 140 in this embodiment has a simple structure, requiring only a few components to implement, and will not significantly increase the complexity and cost of the circuit. At the same time, since the control device 40 is typically an existing control component in the system, the implementation of this solution will not incur additional component costs.

[0044] Example 5

[0045] Please see Figure 5This embodiment details the specific circuit implementation and working principle of each functional module. Voltage detection module 110 includes resistors R4 and R1, forming a voltage divider circuit; alternating voltage module 120 includes an isolation unit 121 and a clamping unit 122. Isolation unit 121 includes capacitor C2, and clamping unit 122 includes diode D1 and resistor R5; delay switch module 130 includes a delay unit 131 and a switching unit 132. Delay unit 131 includes a switching transistor Q3 and capacitor C1, and switching unit 132 includes resistors R2 and R3 and switching transistor Q1; control module 140 includes resistor R6 and switching transistor Q2.

[0046] The first end of resistor R4 is connected to the positive output terminal of input power supply V1. The second end of resistor R4 is connected to the first end of resistor R1 and the first end of capacitor C2. The second end of resistor R1 is grounded. Resistors R4 and R1 form a voltage divider circuit, which converts the voltage change of input power supply V1 into a first detection signal. The level of the first detection signal follows the input voltage change of input power supply V1.

[0047] The second terminal of capacitor C2 is connected to the cathode of diode D1, the first terminal of resistor R5, and the base of switching transistor Q3. The anode of diode D1, the second terminal of resistor R5, and the negative output terminal of input power supply V1 are connected. The collector of switching transistor Q3 is connected to the first terminal of capacitor C1 and the second terminal of resistor R3. The emitter of switching transistor Q3, the second terminal of capacitor C1, and the negative output terminal of input power supply V1 are connected.

[0048] The first end of resistor R2 is connected to the positive output terminal of input power supply V1 and the emitter of switching transistor Q1. The second end of resistor R2 is connected to the first end of resistor R3 and the base of switching transistor Q1. The emitter of switching transistor Q1 is connected to auxiliary power supply circuit A1. The second end of capacitor C1 is connected to the negative output terminal of input power supply V1.

[0049] The first terminal of resistor R6 is connected to the control device, the second terminal of resistor R6 is connected to the base of switching transistor Q2, the collector of switching transistor Q2 is connected to the second terminal of resistor R3, and the emitter of switching transistor Q2 is connected to the negative terminal of input power supply V1. The control device is used to output the control signal "signal".

[0050] Taking a car battery as an example, the auxiliary power supply circuit A1, with input power V1, is typically a DC-DC BUCK chip or an LDO chip. The specific operation is as follows: When the car is not running and the car battery voltage is normal (usually above 12V), the base voltage of the switching transistor Q3 is 0, therefore Q3 is off. Switch Q1 is also off, capacitor C1 is fully charged, the battery does not supply power to the auxiliary power supply circuit A1, and the auxiliary power supply circuit A1 does not operate.

[0051] When the car is started, the car battery voltage will drop to about 8V due to the spark plugs and a series of electrical components working, and then recover within a few seconds as the alternator charges it back up. At this time, the voltage at the midpoint of resistors R4 and R1, i.e., the level of the first detection signal, will decrease first. Since the voltage across capacitor C2 will not change abruptly, the voltage at the N-terminal (cathode) of diode D1 and the second terminal of capacitor C2 will also decrease and be clamped to the voltage drop across diode D1, causing capacitor C2 to discharge slowly.

[0052] At this time, the car alternator starts and charges the battery, restoring the battery voltage to its initial voltage. The voltage at the midpoint between resistors R4 and R1 rises, but since the voltage across capacitor C2 does not change abruptly, the increased voltage is superimposed on the cathode of diode D1, causing capacitor C2 to charge slowly.

[0053] Because the cathode of diode D1 raises the base voltage of switching transistor Q3, Q3 conducts and enters the saturation region. The energy stored in capacitor C1 is discharged by Q3. Switch Q1, with its base voltage pulled low, then conducts, and the battery begins supplying power to auxiliary power supply circuit A1. After the energy stored in capacitor C1 is discharged, capacitor C2 gradually charges, causing Q3 to gradually turn off. Capacitor C1 is then recharged by resistors R2 and R3. Once capacitor C1 is fully charged, the base voltage of Q1 is pulled high, and Q1 turns off again.

[0054] To ensure the battery continues to supply power to the auxiliary power supply circuit A1 after the switch Q1 is turned off again, when the auxiliary power supply circuit A1 starts working, the control device (such as a microcontroller) starts and controls the switch Q1 to conduct through the switch Q2. By turning on the switch Q2, the energy stored in capacitor C1 is discharged by the switch Q2, and the base voltage of the switch Q1 is pulled low, allowing the auxiliary power supply circuit A1 to start working normally. When the microcontroller determines that the auxiliary power supply circuit A1 needs to be shut down, it controls the switch Q2 to turn off, and capacitor C1 is recharged by resistors R2 and R3. When capacitor C1 is fully recharged, the base level of the switch Q1 is raised, the switch Q1 is turned off, and the battery no longer supplies power to the auxiliary power supply circuit A1.

[0055] Unlike existing technologies, this embodiment of the invention utilizes an alternating voltage module and a time-delay switch module. It leverages the characteristic that the battery voltage initially decreases and then recovers during vehicle startup to trigger the switch's conduction. Once the auxiliary power source begins operation, control is transferred to the control device. This avoids the problems associated with using a fixed voltage trigger condition, where the trigger point is set too high to open or too low to close. It also effectively prevents battery power waste and continuous output even when the battery is low on charge. Furthermore, the functions of each module are implemented using simple resistors, capacitors, diodes, and transistors, offering advantages such as simple structure, low cost, and high reliability.

[0056] Based on the switching circuit provided in the above embodiments, this application also provides an energy storage power supply, which includes the switching circuit provided in any of the above embodiments.

[0057] It should be noted that while the preferred embodiments of this utility model are provided in the specification and accompanying drawings, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this utility model; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this utility model specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A switching circuit, characterized in that, include: The system includes a voltage detection module, an alternating voltage module, and a time-delay switch module. The input terminal of the voltage detection module is connected to the input power supply, the output terminal of the voltage detection module is connected to the input terminal of the alternating voltage module, the controlled terminal of the time-delay switch module is connected to the output terminal of the alternating voltage module, the input terminal of the time-delay switch module is connected to the input power supply, and the output terminal of the time-delay switch module is connected to the auxiliary power supply circuit. The voltage detection module is used to detect the voltage change of the input power supply and output a first detection signal; The alternating voltage module is used to generate a trigger signal based on the voltage change of the first detection signal; The delay switch module is used to respond to the trigger signal to turn on so that the input power supply supplies power to the auxiliary power supply circuit, and to disconnect after a preset time after the trigger signal disappears.

2. The circuit according to claim 1, characterized in that, The alternating voltage module includes an isolation unit and a clamping unit. The input terminal of the isolation unit is connected to the output terminal of the voltage detection module, and the output terminal of the isolation unit is connected to the input terminal of the clamping unit and the controlled terminal of the time delay switch module. The isolation unit is used to output a voltage signal to the clamping unit when the voltage of the first detection signal changes; The clamping unit is used to clamp the voltage signal within a preset voltage so as to output the trigger signal to the delay switch module.

3. The circuit according to claim 1, characterized in that, The delay switch module includes a delay unit and a switch unit. The controlled terminal of the delay unit is connected to the output terminal of the alternating voltage module, the output terminal of the delay unit is connected to the controlled terminal of the switch unit, the input terminal of the switch unit is connected to the input power supply, and the output terminal of the switch unit is connected to the auxiliary power supply circuit. The delay unit is used to output a drive signal to the switching unit in response to the trigger signal, and to extend the output of the drive signal for a preset time after the trigger signal disappears; the preset time depends on the charging time of the capacitor in the delay unit. The switching unit is used to turn on in response to the drive signal so that the input power supply supplies power to the auxiliary power supply circuit; the switching unit is turned off when no drive signal is received.

4. The circuit according to claim 3, characterized in that, Also includes: A control module, wherein the input terminal of the control module is connected to the control device, and the output terminal of the control module is connected to the controlled terminal of the switching unit; After the input power supply supplies power to the auxiliary power supply circuit, the control module is used to output the drive signal to the switching unit in response to the control signal of the control device; the control module is also used to stop outputting the drive signal when no control signal is received.

5. The circuit according to claim 2, characterized in that, The voltage detection module includes resistor R4 and resistor R1. The first end of resistor R4 is connected to the positive output terminal of the input power supply, the second end of resistor R4 is connected to the first end of resistor R1 and the input terminal of the alternating voltage module, and the second end of resistor R1 is connected to the negative output terminal of the input power supply.

6. The circuit according to claim 2, characterized in that, The isolation unit includes a capacitor C2, and the clamping unit includes a diode D1 and a resistor R5. The first end of capacitor C2 is connected to the output end of the voltage detection module, the second end of capacitor C2 is connected to the cathode of diode D1, the first end of resistor R5 and the controlled end of the delay switch module, and the anode of diode D1, the second end of resistor R5 and the negative output end of the input power supply are connected.

7. The circuit according to claim 3, characterized in that, The delay unit includes a capacitor C1 and a switching transistor Q3. The base of the switching transistor Q3 is connected to the output terminal of the alternating voltage module. The collector of the switching transistor Q3 is connected to the first terminal of the capacitor C1 and the controlled terminal of the switching unit. The emitter of the switching transistor Q3, the second terminal of the capacitor C1, and the negative output terminal of the input power supply are connected.

8. The circuit according to claim 3, characterized in that, The switching unit includes resistor R2, resistor R3, and switching transistor Q1. The first end of resistor R2 is connected to the positive output terminal of the input power supply and the emitter of the switching transistor Q1. The second end of resistor R2 is connected to the first end of resistor R3 and the base of the switching transistor Q1. The emitter of the switching transistor Q1 is connected to the auxiliary power supply circuit. The second end of resistor R3 is connected to the output terminal of the delay unit.

9. The circuit according to claim 4, characterized in that, The control module includes resistor R6 and switching transistor Q2. The first end of the resistor R6 is connected to the control device, the second end of the resistor R6 is connected to the base of the switching transistor Q2, the collector of the switching transistor Q2 is connected to the controlled terminal of the switching unit, and the emitter of the switching transistor Q2 is connected to the negative terminal of the input power supply.

10. An energy storage power source, characterized in that, include: The switching circuit as described in any one of claims 1-9.

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